a:5:{i:0;s:7:"user_id";i:1;s:9:"user_name";i:2;s:13:"user_password";s:3:"_pk";s:7:"user_id";s:5:"_type";a:3:{s:7:"user_id";s:16:"int(10) unsigned";s:9:"user_name";s:11:"varchar(20)";s:13:"user_password";s:12:"varchar(255)";}}